Liquid purification or separation – Processes – Treatment by living organism
Patent
1993-09-30
1999-05-11
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210629, 210630, 210921, C02F3/30
Patent
active
059024844
ABSTRACT:
Biological processes for treating wastewater include the conventional activated sludge process, which has continuous flow in and out of each treatment cell, and the sequencing batch reactor (SBR) process, which operates on a batch fill and draw basis. The first process operates at a constant level and requires the use of dedicated, relatively expensive external clarifiers to settle mixed liquor suspended solids and recycle activated sludge. The second process does not use separate clarifiers because treatment and settling of mixed liquor suspended solids is accomplished in a single basin, but has a variable level operation and resulting inefficient use of the treatment volume. This substantially constant level biological wastewater treatment process and system enables efficient treatment of wastewater, combining the advantages and eliminating the disadvantages of both SBR and activated sludge processes. In the present case, wastewater continuously flows in one direction through a plurality of treatment cells hydraulically connected in series. The wastewater is subjected to biological treatment in at least one of the cells and settled in at least one last treatment and discharge cell, immediately prior to discharge from the system.
REFERENCES:
patent: 4948510 (1990-08-01), Todd et al.
patent: 5102548 (1992-04-01), Baxter
patent: 5192442 (1993-03-01), Piccirillo et al.
patent: 5213681 (1993-05-01), Kos
patent: 5228996 (1993-07-01), Lansdell
patent: 5354471 (1994-10-01), Timpany et al.
Dutton, Jr. Harold H.
Wyse Thomas G.
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